This is a surprise to no one. Andre won eight Major titles, including the career Grand Slam. He is a former world #1 who in addition to his Major/Slam victories won the Tour Championship and an Olympic Gold Medal. He also helped open up tennis to a larger audience who looked at him and maybe defined tennis differently than they had before. He talks about that here:
The induction ceremony will take place July 9th at the International Tennis Hall of Fame in Newport, Rhode Island.